Can you clarify that equation please? It looks like it may be 2*2/2 (in which case the answer is 2) but it's written as 2x2/2 which doesn't really make much sense to me, especially because the other half of the equation is missing if that is indeed a variable. Does it equal zero in that case?

Q) (WARNING THIS IS A RIDDLE)A blue house is made of blue bricks. A yellow house is made of yellow bricks. A red house is made of red bricks. An orange house is made of orange bricks. What would a green house be made of?